YMMV / World's Finest (1941)

• Accidental Innuendo: In issue #71, Clark and Bruce's chat about swapping identities temporarily sounds awkward out of context:
  Superman: "Hmm.. If we fit each other's roles as well as we do each other's costumes— we'll do fine. Though, frankly, yours is the harder job!"
• Magazine Decay: World's Finest was an anthology title, featuring different characters living solo adventures, becoming a Superman/Batman crossover book in 1954 (thirteen years after its first issue).
• Memetic Mutation: The picture of Batman slapping his protege Robin in mid-conversation is taken from issue #153. Published in 1965, the single-panel illustration has inspired a series of parodies featuring custom-captioned speech bubbles on 4chan, Reddit and elsewhere since 2008, explained with details by Know Your Meme here.

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